WO2000051203A1 - Antenna radiator - Google Patents

Antenna radiator Download PDF

Info

Publication number
WO2000051203A1
WO2000051203A1 PCT/FI2000/000139 FI0000139W WO0051203A1 WO 2000051203 A1 WO2000051203 A1 WO 2000051203A1 FI 0000139 W FI0000139 W FI 0000139W WO 0051203 A1 WO0051203 A1 WO 0051203A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiator
parts
antenna
foot
cte
Prior art date
Application number
PCT/FI2000/000139
Other languages
French (fr)
Inventor
Mikko Moilanen
Original Assignee
Nokia Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Networks Oy filed Critical Nokia Networks Oy
Priority to JP2000601708A priority Critical patent/JP2002538649A/en
Priority to DE60038440T priority patent/DE60038440D1/en
Priority to EP00906398A priority patent/EP1155474B1/en
Priority to BR0008471-9A priority patent/BR0008471A/en
Priority to US09/913,953 priority patent/US6600454B1/en
Priority to AU28084/00A priority patent/AU2808400A/en
Publication of WO2000051203A1 publication Critical patent/WO2000051203A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/104—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces using a substantially flat reflector for deflecting the radiated beam, e.g. periscopic antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/108—Combination of a dipole with a plane reflecting surface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285—Planar dipole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/40—Element having extended radiating surface

Definitions

  • the present invention relates to an antenna radiator consisting of two plate-like or film-like parts connected by their foot ends to each other and also to the supply connection of the antenna.
  • the base transceiver stations of mobile telephone systems use dipole antenna systems comprising dipole antennas adapted for one or more frequency ranges, e.g. 900 MHz and 1800 MHz.
  • the antennas have relatively narrow radiators which consist of two parts extending to both sides of the supply point of the antenna.
  • the antennas have been made e.g. by etching on a fiberglass circuit plate.
  • the radiators of the antennas are relatively narrow.
  • the circuit plate on which the antenna construction has been etched causes dissipation.
  • the dissipation is mainly due to a large current flowing at the foot of the radiator parts and to voltage losses occurring at the tips of the radiator parts.
  • a drawback with present antennas is the magnitude of dissipation, which is a result of especially the fact that the radiator parts are narrow at the foot.
  • the object of the present invention is to eliminate the drawbacks of prior- art solutions and achieve a radiator structure especially applicable for use in base stations of mobile telephone systems.
  • the antenna radiator of the invention is characterized in that, especially to reduce current and voltages losses, the radiator parts are substantially wider at the foot than at the tip.
  • An embodiment of the invention is characterized in that the radiator parts taper from the foot towards the tip.
  • the dipole antenna presented in the figure comprises a film-like dipole radiator of electrically conductive material, consisting of two parts, an upper and a lower part 1 , 2. The parts are connected together by a narrow metal strip 3. Placed behind the radiator 1 , 2 is a reflector 4, whose length somewhat exceeds the height of the radiator.
  • the radiator is a film-like dipole radiator of electrically conductive material, consisting of two parts, an upper and a lower part 1 , 2. The parts are connected together by a narrow metal strip 3. Placed behind the radiator 1 , 2 is a reflector 4, whose length somewhat exceeds the height of the radiator.
  • the antenna is connected by a connecting cable 6 from the supply point at the middle of the strip 3 to the receiver-transmitter apparatus of a base transceiver station.
  • the radiator parts 1 , 2 are of a triangular shape and symmetric with respect to each other so that the upper triangle points upward and the lower triangle 2 downward.
  • each part 1 , 2 tapers linearly from the foot end 11 towards the tip 12.
  • the side 13 in the direction of the main beam is inclined while the side 14 next to the reflector 4 is upright.
  • the current density is significantly smaller than in prior-art solutions, especially at the foot 11 of the radiator parts 1 ,
  • the radiator part 1 tapers linearly, so that the tip 12 of the radiator, which is the most sensitive area of the radiator in respect of the operation of the antenna, is narrow.
  • the tip 12 has a blunt shape to avoid interference.

Abstract

Antenna radiator, consisting of two plate-like or film-like parts (1, 2) connected by their foot ends (11) to each other and to the supply connection of the antenna. To reduce especially current and voltage losses, the radiator parts are substantially wider at the foot (11) than at the tip (12).

Description

ANTENNA RADIATOR
The present invention relates to an antenna radiator consisting of two plate-like or film-like parts connected by their foot ends to each other and also to the supply connection of the antenna.
For instance, the base transceiver stations of mobile telephone systems use dipole antenna systems comprising dipole antennas adapted for one or more frequency ranges, e.g. 900 MHz and 1800 MHz. The antennas have relatively narrow radiators which consist of two parts extending to both sides of the supply point of the antenna. The antennas have been made e.g. by etching on a fiberglass circuit plate. The radiators of the antennas are relatively narrow.
Due to the high frequencies used in mobile telephone systems, the circuit plate on which the antenna construction has been etched causes dissipation. The dissipation is mainly due to a large current flowing at the foot of the radiator parts and to voltage losses occurring at the tips of the radiator parts. A drawback with present antennas is the magnitude of dissipation, which is a result of especially the fact that the radiator parts are narrow at the foot.
The object of the present invention is to eliminate the drawbacks of prior- art solutions and achieve a radiator structure especially applicable for use in base stations of mobile telephone systems. The antenna radiator of the invention is characterized in that, especially to reduce current and voltages losses, the radiator parts are substantially wider at the foot than at the tip.
An embodiment of the invention is characterized in that the radiator parts taper from the foot towards the tip.
When a radiator according to the invention is used, dissipation caused by the circuit plate is reduced because the wide foot part reduces the losses due to the current flowing in the foot. In addition, due to their narrow shape, the tips have a small contact area, thus producing only small voltage losses. Therefore, a good radiation efficiency is achieved.
In the following, the invention will be described in detail by the aid of an example with reference to the attached drawing, which presents an antenna with a radiator according to the invention, suited for use e.g. in a base transceiver station of the 900 MHz mobile telephone network.
The dipole antenna presented in the figure comprises a film-like dipole radiator of electrically conductive material, consisting of two parts, an upper and a lower part 1 , 2. The parts are connected together by a narrow metal strip 3. Placed behind the radiator 1 , 2 is a reflector 4, whose length somewhat exceeds the height of the radiator. The radiator
1 , 2 and the strip 3 have been etched on a fiberglass circuit plate 5. The antenna is connected by a connecting cable 6 from the supply point at the middle of the strip 3 to the receiver-transmitter apparatus of a base transceiver station.
The radiator parts 1 , 2 are of a triangular shape and symmetric with respect to each other so that the upper triangle points upward and the lower triangle 2 downward. Thus, each part 1 , 2 tapers linearly from the foot end 11 towards the tip 12. The side 13 in the direction of the main beam is inclined while the side 14 next to the reflector 4 is upright.
In the radiator of the invention, the current density is significantly smaller than in prior-art solutions, especially at the foot 11 of the radiator parts 1 ,
2, where the current is largest, thanks to the width of the foot end structure. As the current is diminished toward the tip, the radiator part 1 tapers linearly, so that the tip 12 of the radiator, which is the most sensitive area of the radiator in respect of the operation of the antenna, is narrow. In addition, the tip 12 has a blunt shape to avoid interference.
It is obvious to a person skilled in the art that different embodiments of the invention are not restricted to the example described above, but that they may be varied within the scope of the claims presented below.

Claims

1. Antenna radiator, consisting of two plate-like or film-like parts (1, 2) connected by their foot ends (11) to each other and to the supply connection of the antenna, c h a ra cte r i z e d in that, to reduce especially current and voltage losses, the radiator parts are substantially wider at the foot (11) than at the tip (12).
2. Radiator as defined in Claim 1, c h a r a cte r i ze d in that the radiator parts (1 ,2) taper from the foot (11) toward the tip (12).
3. Radiator as defined in claim 2, c h a ra cte r i ze d in that the radiator parts (1,2) taper substantially linearly from the foot (11) toward the tip (12).
4. Radiator as defined in claim 1 in an antenna provided with a reflector (4) behind the radiator, c h a ra cte r i ze d in that the edge (13) of the radiator part on the side facing in the direction of radiation is straight while the edge (14) opposite to the direction of radiation is inclined, or vice versa.
5. Radiator as defined in claim 1, c h a ra cte r i ze d in that the radiator parts (1,2) are connected to each other via a narrow strip-like connecting part (3), the supply connection of the antenna being fitted in conjunction with it.
6. Radiator as defined in claim 1, c h a r a cte r i ze d in that the radiator has been fitted on a circuit plate (5.).
PCT/FI2000/000139 1999-02-24 2000-02-22 Antenna radiator WO2000051203A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2000601708A JP2002538649A (en) 1999-02-24 2000-02-22 Antenna radiator
DE60038440T DE60038440D1 (en) 1999-02-24 2000-02-22 ANTENNA REFLECTOR
EP00906398A EP1155474B1 (en) 1999-02-24 2000-02-22 Antenna radiator
BR0008471-9A BR0008471A (en) 1999-02-24 2000-02-22 Antenna radiator
US09/913,953 US6600454B1 (en) 1999-02-24 2000-02-22 Antenna radiator
AU28084/00A AU2808400A (en) 1999-02-24 2000-02-22 Antenna radiator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI990396 1999-02-24
FI990396A FI990396A (en) 1999-02-24 1999-02-24 antenna radiator

Publications (1)

Publication Number Publication Date
WO2000051203A1 true WO2000051203A1 (en) 2000-08-31

Family

ID=8553929

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2000/000139 WO2000051203A1 (en) 1999-02-24 2000-02-22 Antenna radiator

Country Status (9)

Country Link
US (1) US6600454B1 (en)
EP (1) EP1155474B1 (en)
JP (1) JP2002538649A (en)
CN (1) CN1170342C (en)
AU (1) AU2808400A (en)
BR (1) BR0008471A (en)
DE (1) DE60038440D1 (en)
FI (1) FI990396A (en)
WO (1) WO2000051203A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6860057B1 (en) 1999-09-17 2005-03-01 Kaustmark Oy Swimming device
US7742004B2 (en) 2005-04-04 2010-06-22 Panasonic Corporation On-vehicle antenna system and electronic apparatus having the same

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ504042A (en) * 2000-04-14 2002-12-20 Gregory Daniel Hall A wide-band high-gain plate dipole antenna using a pair of plate elements arranged in the same plane
JP2005191769A (en) * 2003-12-25 2005-07-14 Samsung Electronics Co Ltd Antenna
US7158088B2 (en) * 2005-04-05 2007-01-02 Codjo Atchiriki Magnetic source oscillators universal passive antenna
US20060220975A1 (en) * 2005-04-05 2006-10-05 Codjo Atchiriki Magnetic source oscillators universal passive antenna
JP4722064B2 (en) * 2007-02-27 2011-07-13 ブラザー工業株式会社 Antenna and wireless tag
JP2008278150A (en) * 2007-04-27 2008-11-13 Nec Corp Wideband antenna
US8836599B2 (en) * 2012-03-06 2014-09-16 I-Fong Chen Multi-band broadband antenna with mal-position feed structure
US20140043190A1 (en) * 2012-08-10 2014-02-13 Summit Semiconductor Llc Planar inverted f antenna structure

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5293175A (en) * 1991-07-19 1994-03-08 Conifer Corporation Stacked dual dipole MMDS feed
EP0889543A1 (en) * 1997-06-30 1999-01-07 Sony International (Europe) GmbH Wide band printed dipole antenna for microwave and mm-wave applications

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5691735A (en) * 1992-08-07 1997-11-25 Butland; Roger John Dipole antenna having coupling tabs
FR2754109B1 (en) * 1996-10-02 1998-11-13 Telediffusion Fse HIGH FREQUENCY ANTENNA

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5293175A (en) * 1991-07-19 1994-03-08 Conifer Corporation Stacked dual dipole MMDS feed
EP0889543A1 (en) * 1997-06-30 1999-01-07 Sony International (Europe) GmbH Wide band printed dipole antenna for microwave and mm-wave applications

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6860057B1 (en) 1999-09-17 2005-03-01 Kaustmark Oy Swimming device
US7742004B2 (en) 2005-04-04 2010-06-22 Panasonic Corporation On-vehicle antenna system and electronic apparatus having the same

Also Published As

Publication number Publication date
EP1155474A1 (en) 2001-11-21
CN1341286A (en) 2002-03-20
BR0008471A (en) 2002-02-05
JP2002538649A (en) 2002-11-12
AU2808400A (en) 2000-09-14
FI990396A0 (en) 1999-02-24
DE60038440D1 (en) 2008-05-08
CN1170342C (en) 2004-10-06
EP1155474B1 (en) 2008-03-26
FI990396A (en) 2000-08-25
US6600454B1 (en) 2003-07-29

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